Turn the "sandbox" directory into a package.

RELNOTES: None.
PiperOrigin-RevId: 277590911
diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
index 06e1d7d..b6c021d 100644
--- a/.bazelci/presubmit.yml
+++ b/.bazelci/presubmit.yml
@@ -234,7 +234,7 @@
     - "-//src/test/shell/bazel:maven_test"
     - "-//src/test/shell/bazel:bazel_repository_cache_test"
     - "-//src/test/shell/integration:java_integration_test"
-    - "-//src/test/java/com/google/devtools/build/lib:sandbox-tests"
+    - "-//src/test/java/com/google/devtools/build/lib/sandbox/..."
     # See https://github.com/bazelbuild/bazel/issues/8162 (also disabled for local exec)
     - "-//src/java_tools/buildjar/..."
     - "-//src/java_tools/import_deps_checker/..."
diff --git a/src/main/java/com/google/devtools/build/lib/sandbox/BUILD b/src/main/java/com/google/devtools/build/lib/sandbox/BUILD
index 7e398e2..b9f9722 100644
--- a/src/main/java/com/google/devtools/build/lib/sandbox/BUILD
+++ b/src/main/java/com/google/devtools/build/lib/sandbox/BUILD
@@ -5,10 +5,6 @@
 filegroup(
     name = "srcs",
     srcs = glob(["**"]),
-    visibility = [
-        "//src/main/java/com/google/devtools/build/lib:__pkg__",
-        "//src/test/shell/bazel:__pkg__",
-    ],
 )
 
 java_library(
@@ -22,7 +18,7 @@
         "//src/main/java/com/google/devtools/build/lib:command-utils",
         "//src/main/java/com/google/devtools/build/lib:events",
         "//src/main/java/com/google/devtools/build/lib:io",
-        "//src/main/java/com/google/devtools/build/lib:out-err",
+        "//src/main/java/com/google/devtools/build/lib:os_util",
         "//src/main/java/com/google/devtools/build/lib:process_util",
         "//src/main/java/com/google/devtools/build/lib:resource-converter",
         "//src/main/java/com/google/devtools/build/lib:runtime",
@@ -37,12 +33,13 @@
         "//src/main/java/com/google/devtools/build/lib/shell",
         "//src/main/java/com/google/devtools/build/lib/versioning",
         "//src/main/java/com/google/devtools/build/lib/vfs",
+        "//src/main/java/com/google/devtools/build/lib/vfs:pathfragment",
         "//src/main/java/com/google/devtools/common/options",
         "//third_party:auto_value",
-        "//third_party:gson",
         "//third_party:guava",
         "//third_party:jsr305",
-        "//third_party/protobuf:protobuf_java",
         "@remoteapis//:build_bazel_remote_execution_v2_remote_execution_java_proto",
+        "//third_party:gson",
+        "//third_party/protobuf:protobuf_java",
     ],
 )
diff --git a/src/test/java/com/google/devtools/build/lib/BUILD b/src/test/java/com/google/devtools/build/lib/BUILD
index f80de33..f532719 100644
--- a/src/test/java/com/google/devtools/build/lib/BUILD
+++ b/src/test/java/com/google/devtools/build/lib/BUILD
@@ -66,6 +66,7 @@
         "//src/test/java/com/google/devtools/build/lib/rules/platform:srcs",
         "//src/test/java/com/google/devtools/build/lib/rules/python:srcs",
         "//src/test/java/com/google/devtools/build/lib/rules/repository:srcs",
+        "//src/test/java/com/google/devtools/build/lib/sandbox:srcs",
         "//src/test/java/com/google/devtools/build/lib/skyframe/packages:srcs",
         "//src/test/java/com/google/devtools/build/lib/skyframe/serialization:srcs",
         "//src/test/java/com/google/devtools/build/lib/skyframe:srcs",
@@ -1288,75 +1289,6 @@
     ],
 )
 
-java_library(
-    name = "sandboxfs-base-tests",
-    testonly = 1,
-    srcs = ["sandbox/BaseSandboxfsProcessIntegrationTest.java"],
-    deps = [
-        ":testutil",
-        "//src/main/java/com/google/devtools/build/lib/sandbox",
-        "//src/main/java/com/google/devtools/build/lib/vfs",
-        "//third_party:guava",
-        "//third_party:junit4",
-        "//third_party:truth",
-    ],
-)
-
-java_test(
-    name = "sandbox-tests",
-    srcs = glob(
-        ["sandbox/*.java"],
-        exclude = [
-            "sandbox/BaseSandboxfsProcessIntegrationTest.java",
-            "sandbox/RealSandboxfsProcessIntegrationTest.java",
-        ],
-    ),
-    data = [":embedded_scripts"],
-    local = 1,
-    tags = ["no_windows"],
-    test_class = "com.google.devtools.build.lib.AllTests",
-    deps = [
-        ":analysis_testutil",
-        ":foundations_testutil",
-        ":guava_junit_truth",
-        ":sandboxfs-base-tests",
-        ":testutil",
-        "//src/main/java/com/google/devtools/build/lib:bazel-rules",
-        "//src/main/java/com/google/devtools/build/lib:build-base",
-        "//src/main/java/com/google/devtools/build/lib:os_util",
-        "//src/main/java/com/google/devtools/build/lib:util",
-        "//src/main/java/com/google/devtools/build/lib/actions",
-        "//src/main/java/com/google/devtools/build/lib/sandbox",
-        "//src/main/java/com/google/devtools/build/lib/vfs",
-        "//src/main/java/com/google/devtools/build/lib/vfs/inmemoryfs",
-        "//src/main/java/com/google/devtools/common/options",
-    ],
-)
-
-java_test(
-    name = "sandboxfs-integration-tests",
-    srcs = ["sandbox/RealSandboxfsProcessIntegrationTest.java"],
-    data = [":embedded_scripts"],
-    local = 1,
-    tags = [
-        # On macOS:
-        #   sudo sysctl -w vfs.generic.osxfuse.tunables.allow_other=1
-        # Test requires:
-        #   --test_env=SANDBOXFS=/path/to/sandboxfs
-        "manual",
-        "no-sandbox",
-        "no_windows",
-    ],
-    test_class = "com.google.devtools.build.lib.AllTests",
-    deps = [
-        ":sandboxfs-base-tests",
-        ":test_runner",
-        "//src/main/java/com/google/devtools/build/lib/sandbox",
-        "//src/main/java/com/google/devtools/build/lib/vfs",
-        "//third_party:junit4",
-    ],
-)
-
 java_test(
     name = "standalone-tests",
     srcs = glob(["standalone/*.java"]),
diff --git a/src/test/java/com/google/devtools/build/lib/sandbox/BUILD b/src/test/java/com/google/devtools/build/lib/sandbox/BUILD
new file mode 100644
index 0000000..1809fe1
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/sandbox/BUILD
@@ -0,0 +1,96 @@
+load("@rules_java//java:defs.bzl", "java_library", "java_test")
+
+package(
+    default_visibility = ["//src:__subpackages__"],
+)
+
+filegroup(
+    name = "srcs",
+    srcs = glob(["**"]),
+)
+
+java_library(
+    name = "testutil",
+    testonly = 1,
+    srcs = ["FakeSandboxfsProcess.java"],
+    deps = [
+        "//src/main/java/com/google/devtools/build/lib/sandbox",
+        "//src/main/java/com/google/devtools/build/lib/vfs",
+        "//src/main/java/com/google/devtools/build/lib/vfs:pathfragment",
+        "//third_party:guava",
+    ],
+)
+
+java_library(
+    name = "sandboxfs-base-tests",
+    testonly = 1,
+    srcs = ["BaseSandboxfsProcessIntegrationTest.java"],
+    deps = [
+        "//src/main/java/com/google/devtools/build/lib/sandbox",
+        "//src/main/java/com/google/devtools/build/lib/vfs",
+        "//src/main/java/com/google/devtools/build/lib/vfs:pathfragment",
+        "//src/test/java/com/google/devtools/build/lib:testutil",
+        "//third_party:guava",
+        "//third_party:junit4",
+        "//third_party:truth",
+    ],
+)
+
+java_library(
+    name = "SandboxTests_lib",
+    testonly = 1,
+    srcs = glob(
+        ["*.java"],
+        exclude = [
+            "BaseSandboxfsProcessIntegrationTest.java",
+            "FakeSandboxfsProcess.java",
+            "RealSandboxfsProcessIntegrationTest.java",
+        ],
+    ),
+    deps = [
+        ":sandboxfs-base-tests",
+        ":testutil",
+        "//src/main/java/com/google/devtools/build/lib/sandbox",
+        "//src/main/java/com/google/devtools/build/lib/vfs",
+        "//src/main/java/com/google/devtools/build/lib/vfs:pathfragment",
+        "//src/main/java/com/google/devtools/build/lib/vfs/inmemoryfs",
+        "//src/main/java/com/google/devtools/common/options",
+        "//src/test/java/com/google/devtools/build/lib:testutil",
+        "//third_party:guava",
+        "//third_party:junit4",
+        "//third_party:truth",
+    ],
+)
+
+java_test(
+    name = "SandboxTests",
+    size = "medium",
+    data = ["//src/test/java/com/google/devtools/build/lib:embedded_scripts"],
+    test_class = "com.google.devtools.build.lib.AllTests",
+    runtime_deps = [
+        ":SandboxTests_lib",
+        "//src/test/java/com/google/devtools/build/lib:test_runner",
+    ],
+)
+
+java_test(
+    name = "sandboxfs-integration-tests",
+    srcs = ["RealSandboxfsProcessIntegrationTest.java"],
+    data = ["//src/test/java/com/google/devtools/build/lib:embedded_scripts"],
+    local = 1,
+    tags = [
+        "manual",  # Test requires: --test_env=SANDBOXFS=/path/to/sandboxfs
+        "no-sandbox",
+        "no_windows",
+    ],
+    test_class = "com.google.devtools.build.lib.AllTests",
+    runtime_deps = [
+        "//src/test/java/com/google/devtools/build/lib:test_runner",
+    ],
+    deps = [
+        ":sandboxfs-base-tests",
+        "//src/main/java/com/google/devtools/build/lib/sandbox",
+        "//src/main/java/com/google/devtools/build/lib/vfs",
+        "//third_party:junit4",
+    ],
+)